misc: bcm-vk: validate write size before allocation

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bcm_vk_write() uses the user-supplied write count to size a
flexible-array work entry and then copies count bytes into that array.
The allocation expression is evaluated before any overflow check, so a
very large count can wrap the allocation smaller than the subsequent
copy.

Reject empty writes, check the allocation arithmetic before kzalloc(),
and initialize the __counted_by field before copying into to_v_msg[].

Signed-off-by: Yousef Alhouseen <alhouseenyousef@gmail.com>
Link: https://patch.msgid.link/20260629160605.29412-1-alhouseenyousef@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Yousef Alhouseen 2026-06-29 18:06:05 +02:00 • committed by Greg Kroah-Hartman

parent 808e530654

commit f66c40cd90

1 changed files with 12 additions and 6 deletions

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drivers/misc/bcm-vk/bcm_vk_msg.c

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